Jonathan d



J. D. MAWHOOD.

(No Model.)

ROLLER MILL.

No. 381,710. Patented Apr, 24, 1888.

[NVE/VTOR:

A TTOR/VE Y- WIYI VESSES:

UNTTED STATES PATENT Unison,

JONATHAN D. MAWHOOD, OF RIGHMOND, INDIANA, ASSIGNOR TO THE RICHMOND CITY MILL WORKS, OF SAME PLACE.

ROLLER-MILL.

QPECIFZGAHON forming part of Letters Patent llo. 381,710, dated April Application filed December 80, 1886. Serial No. 222,997. (No model.)

To all whom,- it may concern.-

Be it known that I, JQIIATHAN D. MAW- HOOD, of Richmond, Vv'ayne county, Indiana, havein vented certain new and useful Improve ments in Roller-Mlils, of which the following is a specification.

This inventions pertains to roller-mills; and the improvements relate to the roll-supporting and rolladj usting mechanism of such mills.

My improvements will be readily understood from the following description, taken in connection with the accompanying drawings, in which- Figure l is a side elevation of the frame, rolis, and roll supporting and adjusting incchanism of a double-roller mill illustrating my improvements, portions of some of the details being shown in vertical section; Fig. 2, a plan of the same, the rolls and the duplicate set of roll supporting and adjusting devices at the rear side of the mill being omitted; Fig. 8, a

vertical section through one of the housings which furnishes bearings for the fixed rolls, the plane of the section being parallel with the axis of the rolls, as indicated by central vertical dotted lines in Figs. 1 and 2; Fig. i, a vertical section through the lower end of one of the pivot-housings carrying the bearings for the movable roll, the plane of the section being at right angles to the axis of the rolls; and Fig. 5, a view of the inner faces of the same. Figs. 4 and 5 are upon a somewhat enlarged scale. 3y movable rolls are meant those rolls which are adjusted to and from the rolls in connection with which they are operated, and by fixed rolls is meant the rolls which are not thus adjusted.

In the drawings, A indicates the frame of the mill; B, the fixed rolls; 0, the movable rolls; D, bosses projecting outward from the side faces of the frame and intended to have bolted against them various parts of the rollsupporting and roll-adjusting devices; E, the housingof the fixed rolls, the same consisting ofa casting containing two bearings for one end of each of the fixed rolls, it being understood, of course, that there is to be one of these housings at each side of the mill, as is the case, in fact, with all of the details of the present device; F, (lowuwardly-projecting lugs at the ends of this housing, the housing being hereinafter spoken of as the fixed-roll housing, such lugs having parallel faces themselves parallel to the axis of the rolls; G, bolts engaging against which the inner side faces of these lugs hear, these bolts serving to secure the housing rigidly to the side of the frame; H, a hanger formed with the fixed-roll housing and depending therefrom, this hanger having its outer face set back some distance from the outer face of the lugs F; J, a pair of eccentric-shafts disposed across the frame of the machine below the fixed rolls and journaled in the hangers H at the opposite sides of the mill, the ends of these eccentric-shafts projecting outward at each side of the mill to receive attachments; K, spur-gears fast upon the eccentric-shafts and located between the outside of the frame and the inside of the fixed-roll housings. These spur-gears mesh with each other, so that rotary motion of one eccentric shaft becomes transmitted simultaneously to the other shaft, a pair of these gears being placed, preferably, at each side of th mill; L, a hand-lever pivoted to the fixed-roll housing and connected by link and crank with the projecting end of one of the eccentric-shafts, the office of the lever being topartially rotate the eccentric shafts, its performance being precisely as if thelever were secured directly to one of these eccentric-sliafts,thecrank-andlink connection serving merely to permit a more central dis position of the lever; M, a pair of horizontal bars whose inner threaded ends pass through the lugs F and are provided with nuts at each side of the lugs, these bars projecting from these lugs outwardly horizontally under the journals of the movable rolls, the main portion of the bars being of rectilinear section and having their outer ends lying against appropriate ones of the bosses D, the outer ends of the bars being provided each with. a slot; N, an eccentric engaging within the end slot of each of these bars, theinner face of the eccentric setting nearly against its boss D, and its outer end being provided with a hexagonal head or flange lying against the outer face of its bar; 0, the movable-roll housings, the same being in the form of vertical levers pivoted upon the bars M and having the movableroll bearings formed in their upper ends and these lugs, and also those of the bosses D,

having inwardly-opening spring-cases formed in their lower ends; P, a mortise through the intermediate portion of each of these movableroll-housings, the samereceiving the bars M, the side walls of these mortises being convex, as seen in Fig. 5; Q, pivot-bolts passing through the movable-roll housings across the mortise and through the bars M, these bolts fitting tightly, preferably, in the housings, and fitting so loosely in. the bars M as to permit the housings to have a free rocking motion to a limited extent in every direction upon the bars; R, bolts passing through the eccentrics N and engaging in the boss D at the eccentrics, these bolts serving as the pivots upon which the eccentrics may turn, and also as the means by which the eccentrics may be clamped firmlyagainst the bars; S, swinging nuts, presenting threaded openings outwardly toward the lower ends of the movable-roll housings and freely journaled upon the eccentric ends of the shafts J; T, adjustingscrews engaging the swinging nuts and reaching outward through the lower ends of the movable-roll housings, and provided at their outer ends with hand-wheels, and near their outer ends with spline-grooves; U, a teat projecting outward from the lower end of each movable-roll housing, just below its adjusting-screw T, and into engagement with the hub of the handwheel upon the adjusting-screw; V, an inwardly-opening springcase formed in the lower end ofeach of the movable-roll housings, the adjusting-screw passing axially through these spring-cases; WV, a teat projecting inwardly from the end wall of each spring-case directly over the adjusting-screw; X, a collar upon each adjusting-screw within its spring-case, the outer face of the collar bearing against the teat W, the collar having a comparatively long hub fitting upon the adjusting-screw and free for endwise movement thereon; Y,acollar upon each adjustingscrew, and free to slide thereon, this collar closing the inner end of the spring-case; Z, a spiral spring encircling the adjusting-screw within the spring-case, and compressed endwise between the collars X and Y; a, a notch in the wall'of the spring-case engaged bya tongue projecting radially from the collar Y, such notch and tongue serving to prevent rotation of the collar Y without interfering with its proper endwise motion; [2, a hand-nut upon the adjusting-screw, near the collar Y, this hand-nut serving in adjusting the position of the collar Y, and consequently the degree of compression of the spring; 0, a collar interposed between the collar Y and the nut b, this collar being free to slide upon the-eadjustingscrew, but being prevented from rotation thereon by being splined to the adjustingscrew, the drawings Figs. 5 and 4 showing the screw as having a splineway engaged by a set screw'in the collar 0, the set-screw, however, performing no pinching office, its duty being simplyto enter the splineway and thereby preventrotation of the collar upon the screw; and

such parts being, for instance, the fixedroll housings. The bosses D upon the frame are made so short as not to reach into engagement with these housings when the housings occupy their proper positions, thus leaving a space between the outer ends of the boss and the inner faces of the housings. I then lute properly around the box and pour soft metal into these spaces. This course is followed in connection with all of the bosses, and the result is that I conveniently and cheaply secure accurate and perfect endwise distances for the bosses. In the drawings the facings d represent the soft metal thus applied.

The soft metal employed is of low fusibility and flows closely around the bolts and into the facial inequalities of the bosses and contiguous parts. v I

The adjustment of the movable rolls with reference to the fixed rolls is effected by oscillating the movable-roll housings through the medium of the adjusting-screw, such adjustment serving in regulating the Working-distances between the rolls. As the movable-roll housings are loose upon the bolts Q,th'e housings are at liberty to rock sidewise upon the bars, whereby the movable-roll housings are endowed with the qualities of universal self adjusting bearings-that is, the hearings will adjust themselves into parallelism with the journals of the rolls which they support.

The bars M serve as supports for the movable-roll housings, and the nuts upon the ends of the bars serve as means by which the pivotbolts Q at each end of a movable roll may be adjusted to equal distances from the axis ofthe corresponding fixed roll. Furthermore, the bars Mform tension elements to meet the working-strains, and any shifting of the fixed-roll housing upon the frame of the mill will not disturb the relation of the two rolls of a pair,

as such shifting will shift also the bars M, and

with them the movable-roll housing, the bars M shifting endwise upon the eccentric which supports their ends. The eccentrics N serve as end supports for the outer ends of the bars M, and also in vertically adjusting the outer ends of the bars, whereby the axes of the movable rolls may be brought truly into the planes of the appropriate fixed rolls. The eccentrics N are turned by a wrench applied to their hexagonal flanges, and are fixed in adjusted position by the clamping action of the bolts R.'

The inner ends of the bars M will readily flex sufficiently to permit of the small adjusting movement of their outer ends.

The lever L serves in giving partial rotation to one ofthe eccentric-shafts J, and through IIO the medium of the spur-gearing to the other eccentricshaft, and the rotation of the eccentric'shaftsservesin an obvious manner in opening the rolls. The employment of the two eccentric-shafts .1, moving simultaneously, but each operating its own movable roll, guards against peculiar worhingstrains and shocks due to the action of one set of rolls being transmitted to the other pair of rolls. One eccentric-shaft might be arranged in the ordinary manner to operate the housings of both movable rolls; but the result of such construction would be that any extraordinary outward movement of one movable roll would transmit the shock and some slight movement to the single eccentric-shaft, and the single eccentricshaft would in turn transmit shock and movement to the other movable roll-a fault entirely avoided in the present arrangement.

As the fixed rolls and the inner ends of the bars M and the eocentricshafts all find support in the rigidly-constructed fixed-roll housings, it follows that an iutegrality of strainresisting structure is secured in a system of construction independent of the body or frame of the machine for its strength in meeting the working-strains.

By setting the fixed-roll housings outward some distance from the sides of the frame, as

governed by the length of the bosses D, room is secured behind these housings for the spurgears, and by transposing the front face of the hanger H backward some distance from the general front face of the fixed-roll housing it becomes possible to locate the adj Listing-screws T directly below the center of length of the roll-bearings.

The springs Z serve to press the movable rolls toward the fixed rolls as far as the adjusted length of the adjusting-screws T will permit, and the elasticity of the springs permits the automatic outward movement of the movable rolls when any foreign substance passes between the rolls, the springs yielding in such case and permitting the lower ends of themovable-roll housing to move inward upon the adjusting screw. Turning the adjustingscrews by means of the handwhecls upon their outer ends serves in adjusting the grindingdistances between the fixed and movable rolls; but such turning of the adj Listing-screws for the purpose of adjusting the grinding-spaces does not in any manner or to any degree affect 1 the tension of the springs, for the reason that during such adjustment of the adjustingscrews the abutments at each end ofthe springs 3 are carried along with the lower end of the movable-roll housings.

The tension of the springs is adjusted by means of the hand- 11 uls b,which serve in lengthening or shortening the distances between the abutments at opposite ends of the springs,and this adjustment does not in any manner affect the measure of the grinding-space of the rolls. When the hand nut 11 is turned to adjust the tension of a spring, the collar 0 slides along upon the adjusting screw, and the collar Y of l course moves with it. When the adjustingscrew is turned to regulate the grinding-distances between the rolls, the collar Y does not revolve, being prevented therefrom by the tongne-and-slot arrangement; but the collars will revolve with the screw by reason of the spline arrangement, and of course the hand nut I) also revolves with the screw. The interposition of the spline-collar 0 therefore prevents the disturbance of the handnut b as the adj ustingscrew is turned.

The adjusting screws, where they pass through the outer end walls of the springcases, do not find bearings of the usual character therein, but, on the contrary, are free of any peripheral contact, the screws having thrust bearings only at this point. These thrust bearings are formed by the teats W and U, the outer one, U, below the screw, the inner one,\V, above the screw, one of these teats being against the hub of the hand-wheel on the adj ustingscrew, the other one bearing against the face of the collar at the outer end of the spring. It follows that the outward pressure of the spring will tend to push the upper end of the movable-roll housing outwardly, the lower teat,U, acting as afulcrum. The result of this arrangement is that the movableroll housings are always, whether the rolls be running empty or not, strained against the inner peripheral surfaces of the pivotbolts Q, upon which they rocka condition which nuilifies all of the usual evil effectsof lost motion at the rocking point of movableroll housings.

I claim as my invention-- 1. In a roller-mill, a frame, a pair of rolls, a roll-housing for one roll of the pair, a supporting-bar for the housing of the movable roll, and a rolihousing for said movable roll, said housing having a mortise loosely engaging said bar, so as to be free to rock in all directions thereon, and a pivot-bolt uniting said movable-roll housing to said bar, combined substantially as and for the purpose set forth.

2. In a roller-mill, a frame, afiXed-rollhousing provided with a downwardly-projecting ing, a bar at the side of the frame provided with a threaded end, and nuts engaging said lugs, an outer end support forsaid bar, and a movable-roll housing pivoted to said bar,con1- bined substantially as and for the purpose set forth.

3. In a roller-mill,afran1e,a fixed-rollhousing, a bar, M, projecting therefrom and having an end slot, a lever-form movable-roll l housing having an intermediate mortise engaging said bar, and an eccentric, N, supg ported by the frame and engaging said end 1 slot,coinbined substantially as and for the purpose set forth.

f 4. In a roller-mill, aframe, afiXed-rollhousing, a movable-roll housing, a nut, an adjustl ing-screw, T, engaging said nut and having a hand-wheel engaging outsidethe movable-roll housing, spring Z upon said screw, a nut, 1),

upon said screw for adjusting the tension of l l i the spring, and a collar, 0, splined to the screw and disposed between said spring and said nut 5, combined substantially as and for the purpose set forth.

5. In a roller-mill, a frame, a fixed-roll housing, a pivoted-roll housing provided with teats W and U, a screw, T, having threaded connection with the frame, a hand-wheel fast on said screw and engaging said teat U, a collar, X, on said screw and engaging said teat W, spring Z on said screw engaging said collar X, and nut and collar on the screws to serve in adjusting the tension of the spring, combined substantially as and for the purpose set forth.

forth. -l

JONATHAN D. MAWHOOD. \Vitnesses:

JOSEPH G. LEMM, S. E. SWAYNE. 

